Founded in 1990, China Famen Bearing Co., Ltd. is specialized general bearing manufacturer and general bearings distributor of all types of custom and cheap bearings. We obtained ISO9002, ISO14001, and QS9000 certificates in 1995 and 1996, 1999 respectively. Other advanced equipments include four RGB and RCI series heat treatment production lines with a treatment quantity totaling 1,500 kilograms per hour. The Multi-points temperature control meters and CNC display meters with bi-directional control have been adopted to complement these units.

The needle bearing has rollers that are very long as compared to their diameters. Cages are frequently not used, and the inner ring may or may not be present. The outer ring may consist of hardened thin-walled metal as shown in Fig. 1-13; the housing in which the bearing is mounted must have sufficient thickness to give adequate support. The friction of needle bearings is several times as great as for ordinary cylindrical roller bearings. Because of the tendency of the unguided rollers to skew, needle bearings are particularly adapted to oscillating loads, as in wrist pins, rocker arms, and universal joints. For continuous rotation, needle bearings are usually suitable where the loading is intermittent and variable so that the needles will be frequently unloaded and thus tend to return to their proper locations. When the application involves angular misalignment of the shaft, two short bearings end to end usually are better than one bearing with long rollers. The needle bearing is low-priced and requires very little radial space.

Roller bearings are selected by a process similar to that used for ball bearings. They must be chosen, however, in accordance with the recommendations given in the catalog of the manufacturer of the particular type of bearing under consideration.
Roller bearings are usually made of case-hardened steels. The carburized case or exterior should have a hardness of 58-63 Rc. The core is softer with a hardness of 25-40 Rc. Certain plain-carbon and alloy steels have been found suitable for roller bearing service. The maximum temperature is limited to about 350? F.
Designed for ease of mounting, Fafnir wide inner ring ball bearings carry radial, axial and combination loads. The assembly consists of a single-row ball bearing with an inner ring that extends on both sides for maximum shaft support. The extended inner ring slips onto the shaft and is attached by a self-locking collar or setscrew locking device. In either style, the bearing can be positioned easily on the shaft without shoulder, locknuts or adapters.

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